SVGEvent is only Gecko, Blink also has SVGEvents

As pointed out by zcorpan in #227.

Author: ayg

dom.bs

@@ -4956,7 +4956,7 @@ invoked, must run these steps:
     <tr><td>"<code>errorevent</code>"<td>{{ErrorEvent}}
     <tr><td>"<code>event</code>"<td rowspan=2>{{Event}}<td rowspan=2>
     <tr><td>"<code>events</code>"
-    <!-- htmlevents and svgevent also map to Event -->
+    <!-- htmlevents and svgevents also map to Event -->
     <tr><td>"<code>focusevent</code>"<td>{{FocusEvent}}<td>[[!UIEVENTS]]
     <tr><td>"<code>hashchangeevent</code>"<td>{{HashChangeEvent}}<td>[[!HTML]]
     <tr><td>"<code>htmlevents</code>"<td>{{Event}}<td>
@@ -4969,7 +4969,7 @@ invoked, must run these steps:
     <tr><td>"<code>popstateevent</code>"<td>{{PopStateEvent}}
     <tr><td>"<code>progressevent</code>"<td>{{ProgressEvent}}<td>[[!XHR]]
     <tr><td>"<code>storageevent</code>"<td>{{StorageEvent}}<td>[[!HTML]]
-    <tr><td>"<code>svgevent</code>"<td>{{Event}}<td>
+    <tr><td>"<code>svgevents</code>"<td>{{Event}}<td>
     <tr><td>"<code>svgzoomevent</code>"<td rowspan=2>{{SVGZoomEvent}}<td rowspan=2>[[!SVG]]
     <tr><td>"<code>svgzoomevents</code>"
     <tr><td>"<code>textevent</code>"<td>{{CompositionEvent}}<td>[[!UIEVENTS]]

dom.html

@@ -2835,7 +2835,7 @@ <h3 class="heading settled" data-level="4.5" id="interface-document"><span class
         <td><code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/webstorage.html#storageevent">StorageEvent</a></code>
         <td><a data-link-type="biblio" href="#biblio-html">[HTML]</a> 
        <tr>
-        <td>"<code>svgevent</code>"
+        <td>"<code>svgevents</code>"
         <td><code class="idl"><a data-link-type="idl" href="#event">Event</a></code>
         <td>
        <tr>